Chevrolet Equinox Service Manual: Drive Range, Sixth Gear Automatic Transmission Unit

As the vehicle speed increases, the transmission control module-(TCM) receives inputsignals from the automatic transmission input and output speed sensors, the throttleposition sensor and other vehicle sensors to determine the precise moment to commandON the normally-low 26-pressure control solenoid-4-(PCS). At the same time the normally-high35R-pressure control solenoid-2 is commanded OFF.

2-6 Clutch Applies

26 Pressure Control Solenoid 4

The 26-pressure control solenoid-4 is commanded ON, allowing actuator feed fluid toenter the PCS-26-clutch fluid circuit. PCS-26 fluid is routed through orifice-#32and then to the 2-6-clutch regulator valve.

2-6 Clutch Regulator Valve

PCS-26-clutch fluid moves the 2-6-clutch regulator valve assembly against the 2-6-clutchregulator valve spring force to allow 26-clutch/1234-clutch feed fluid to pass throughthe valve. The 26-clutch/1234-clutch feed fluid is routed into the 26-clutch fluidcircuit where it passes through orifice-#46 and then to the spring end of the 2-6-clutchregulator valve,and to the 2-6-clutch.

2-6 Clutch

The 26-clutch fluid from the 2-6-clutch regulator valve is routed to the 2-6-clutchpiston assembly. The 26-clutch fluid pressure moves the piston against 2-6-clutchspring force to apply the 2-6- clutch plates.

3-5 Clutch Releases

35R Pressure Control Solenoid 2

The 35R-pressure control solenoid-2 is commanded OFF, allowing PCS- 35-reverse clutchfluid from the 3-5-reverse clutch boost valve and the 3-5-reverse clutch regulatorvalve to exhaust through the solenoid.

3-5 Reverse Clutch Boost Valve

The 3-5-reverse boost valve spring force moves the valve to allow 35-reverse clutchfeedback fluid from the 3-5-reverse clutch regulator valve to enter the 35-reverseclutch circuit and exhaust.

3-5 Reverse Clutch Regulator Valve

The 3-5-reverse clutch regulator valve spring force moves the valve to allow actuatorfeed limit fluid to pass through the valve and enter the PS2 fluid circuit which opensPS2. The 35-reverse clutch fluid then enters the exhaust backfill fluid circuit andis routed through orifice-#30 to the exhaust backfill pressure relief valve whereexcess pressure is exhausted.

3-5 Reverse Clutch

The 3-5 reverse clutch spring force moves the 3-5 reverse clutch piston to releasethe 3-5 clutch plates and forces 35 reverse clutch fluid to exhaust from 3-5 reverse/456clutch housing. The 35 reverse clutch fluid is then routed to the 3-5 reverse clutchregulator valve where it exhaust excess pressure.

Drive Range, Sixth Gear

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